Call blocker and also effective SMS blocker. It blocks unwanted calls and spam messages. You can add any number to the blacklist or enable one of blocking options: "Private numbers" "Unknown numbers" or "All calls".

Also you can block calls or messages by prefix. This app is easy to use lightweight and provides wide range of functions.

This app also provides fully functional built-in SMS messenger.

PRO version advantages:
✔️ Password protection.
✔️ Schedule by days of the week.
✔️ Blocking method selection (required Android 7 or higher).
✔️ No ads.
✔️ Pay once and use forever.

Features:
✔️ Block calls and SMS using blacklist.
✔️ Block unknown numbers.
✔️ Block private/hidden numbers.
✔️ Block a range of numbers using the "Begins with" option.
✔️ Block SMS from alphanumeric numbers.
✔️ Block SMS by text.
✔️ Block all numbers.
✔️ Block all calls while audio chat or VoIP call is established.
✔️ Use "Whitelist" to prevent block of certain people.

✔️ Icon in the status bar can be turned off.
✔️ Get notifications of blocking or turn them off.
✔️ "Schedule": specify time to block calls or messages.
✔️ "Log" of blocking.

✔️ Save/load blacklist.
✔️ Turn on/off blacklist.
✔️ Robust call blocker and SMS blocker.

You can try the free version before you buy this application.